The Olympic medallist was joined by Oscar-winning screenwriter boyfriend Dustin Lance Black at the central London nightclub, where they were snapped deep in conversation on the balcony.
As well as watching former X Factor contestant Luke on stage, it seems Tom also had a go at entertaining the audience – even if they didn't know it!
G.A.Y owner Jeremy Joseph tweeted: "Loving That Dance Floor Was packed At G-A-Y Last Night & No One knew that @TomDaley1994 DJed for a few tracks including Sexy & I Know it."
While Tom, 19, may have kept his DJ set a secret, he was more than happy to pose backstage alongside Jeremy and his oh-so-adorable dog Jacob.
Tom Daley plus a cute dog? We've melted a little…
Earlier in the evening, the Olympic bronze medallist had been out for a celebratory dinner in London with Dustin, who had been in the audience at Splash! to support his man.
The second series of Splash! premiered on ITV with nearly five million viewers.
The first episode saw Diversity's Perri Kiely and Michaela Strachan progress to the next stage, while Hollyoaks' Gemma Merna, TOWIE favourite Gemma Collins and ex-EastEnders actor Ricky Groves were all sent home.
It returns for the second heat on Saturday, 11 January on ITV.